dsc-4621/2 is a high-performance high-speed bidirectional bus transceiver produced by idt company. it has a 9-bit parity checker/generator, can provide buffered direction and three-state control, error flag with open-drain output, iol = 48ma (commercial) and 32ma (military)
The IDT54/74FCT833A and IDT54/74FCT833B are high‑performance, fast CMOS parity‑bus transceivers designed for two‑way communication in processor‑organized devices. They provide an 8‑bit data path in each direction, a 9‑bit parity generator/checker, and error‑flag functionality with open‑drain output. Variants differ in speed (the B version is about 30 % faster) and are available in plastic DIP, CERDIP, LCC and SOIC packages, including radiation‑tolerant and radiation‑enhanced versions.
Electrical specifications include commercial output sink current of 48 mA (32 mA for military), input leakage as low as 5 pA, operating temperature ranges of 0 °C to +70 °C (commercial) and –55 °C to +125 °C (military), and typical supply voltage of 5.0 V. Detailed timing parameters such as propagation delays (10‑14 ns) and power‑supply characteristics are provided for both commercial and military grades.
| Output sink current (commercial) | 48 mA |
|---|---|
| Output sink current (military) | 32 mA |
| Input leakage current | 5 pA max |
| Commercial temperature range | 0 °C to +70 °C |
| Military temperature range | -55 °C to +125 °C |
| Typical supply voltage | 5.0 V |
The device can sink up to 48 mA in the commercial version and 32 mA in the military version.
It operates from 0 °C to +70 °C for commercial parts and from –55 °C to +125 °C for military parts.
The transceiver is offered in plastic DIP, CERDIP, leadless chip carrier (LCC) and small‑outline IC (SOIC) packages, with radiation‑tolerant options.
Typical operation is at a supply voltage of 5.0 V.